SEALED CONTAINER FOR HAZARDOUS MATERIAL

Abstract: A container suitable for use in the transportation of hazardous materials, for example radiolabelled material, has a base cup member (12) which is closed by a threated lid (13). Within the cup member (12) a liner (17) is provided whithin an inner cavity (16). The liner (17) is suspended from an end flange(18) which is in engagement with the upper face of the rim of the cup member (12). The liner (17) has an annular shoulder (23) spaced from the end flange (18). The shoulder (23) is arranged so that it engages and thereby seals with the head (26) of a closure element (25). The closure element (25) also includes means (31) to enable it to be removed from the liner (17). The container is usually mounted within a two-part inner casing (10a, 10b) which in turn is positioned within an outer casing (11a, 11b). With the container described hazardous materials even in liquid form may be stored and transported safely as desired whithout the need for bulky packaging.

Description: Sealed container for hazardous material This invention relates to containers and has a particularly useful but not exclusive use in relation to containers for the shipment of radiolabelled and other hazardous materials. These containers in some instances carry only a few microlitres. In the case of radiolabelled compounds such as 32P-, 33P- and 35S-labelled nucleotides, the compounds have hitherto been transported from the site of manufacture to the end user at low temperatures (for example packed in dry ice at a temperature of -70 C to -80°C) to minimise radiochemical decomposition and this has resulted in bulky packaging which is inconvenient for disposal by users. We have recently developed novel formulations of these substances which exhibit marked thermal stability at temperatures as high as 40°C and these new substances can therefore be transported in liquid form at ambient temperatures with the following advantages: (i) the substances can be supplied in small more "environmentally-friendly" packages instead of in bulky expanded polyst y rene vessels containing dry ice, (ii) reductions in package weight and the fact that there is no longer a need to use dry ice can provide savings in packaging and shipping costs, and (iii) the end user can sample the product immediately upon receipt, without the need for a lengthy thawing step. A pre-requisite of ambient shipment of radiochemical liquids is the development of primary packaging in which the liquid is contained in the desired position during shipment and is readily and safely accessible to the user upon opening. This is not an issue with dry ice shipment where the product is frozen at the base of the primary "v-vial" commonly used in such packages. According to the present invention there is provided for a container having internally thereof a cavity opening to a neck portion of the container and a cap releasably secured on the neck, a liner adapted for disposition in the cavity and having an end flange arranged for engagement on the end of the neck, the liner having internally thereof and spaced from the inner end thereof an annular shoulder facing towards said end flange, and a sealing element for sealing the inner end portion of the liner and comprising a head adapted to form a seal with said shoulder and a stem extending along the liner for engagement with the underside of the cap whereby the cap operates to press said head into sealing engagement with said shoulder. The invention also provides a container having a neck to which opens a cavity formed in the container a cap releasably secured on said neck and covering the opening to said cavity, a liner disposed within the cavity and having an end flange by which the liner is supported from the upper end of the neck, the liner having internally thereof and spaced from its inner end an annular shoulder facing towards said end flange, and a sealing element having a head adapted to abut the shoulder and to form a liquid-tight seal therewith and a stem extending towards said end flange, the outer end of the stem being arranged for engagement with the underside of the cap such that when the cap is secured on said neck the head of the closure element is held in sealing engagement with the shoulder. Two embodiments of the invention will now be described by way of example. The description makes reference to the accompanying drawings in which: Figures 1 and 2 respectively show in sectional elevation two containers according to the invention. In each of the two embodiments the container is shown removably disposed in a two-part inner casing 10a, 10b which is in turn disposed in a multi-part outer casing 11a, 11b incorporating lead shielding. Referring now to Figure 1 of the drawings the container has a base part 12 formed from a transparent plastics mate-rial such as acrylic and providing an internal cav :.y 16, and a screw-cap 13 engaged on a screw-threaded collar portion 14 of the neck of the container. Spaced above the collar 14 the neck has a radially thickened end-part 15. The cavity 16 of the container is of generally cylindrical form with a rounded inner end, and a translucent liner 17 in the form of a v-vial made from a plastics material such as polypropylene is suspended by an end flange 18 thereof within the cavity. The end flange 18 of the liner rests on the top of the neck and has a down-turned skirt 19 which fits against the radially outer surface of the thickened end part 15 of the neck and which has an inturned lip 20 below the part 15. The end flange has an integral upstanding annular land 21 which is abutted by a gasket 22 contained within the cap 13. The upper portions of the liner 17 are disposed close to the wall of the recess, but the lower portions of the liner are of reduced diameter and are spaced away from the wall of the recess. The liner has spaced above its rounded lower or inner end an annular internal shoulder 23 facing towards the neck and a sealing element 25 extending along the liner has a head 26 which abuts the shoulder to form a seal. The shoulder 23 is substantially conical and the contacting surface of the head is part-spherical. The stem 27 of the sealing element is of much smaller diameter than the liner except at its outer end where it has an increased diameter portion 28 which is a loose fit against the internal surface of the liner and which provides an annular shoulder 29 at its inner end. The sealing element has a further annular shoulder 30 disposed inwardly of the shoulder 29 and facing towards the head 26. The upper end of the portion 28 abuts the gasket 22. An elongate conical recess 31 is formed in the upper end of the portion 28, and, when the cap 13 has been removed, is frictionally engageable by the correspondingly conical end of a rod-like implement e.g. a pipette tip (not shown) to enable the sealing element 25 to be lifted out of the cavity. The construction illustrated in Figure 2 is generally similar to that shown in Figure 1 and corresponding components are indicated by corresponding reference numerals. In the arrangement of Figure 2, however, the sealing element 25 is attached to the underside of the cap 13. For this purpose no gasket is provided on the underside of the cap, and the upper end of the sealing element 25 extends upward beyond the end flange 18 and has an end portion 32 the outer diameter of which is an interference fit within the side wall of the cap. Alternatively the upper end of the sealing element may be bonded to the underside of the cap. The underside of the enlarged end portion 28 of the sealing element abuts the sealing land 21 on the end flange of the liner. In the arrangement of Figure 1 the sealing element 26 can be placed in a centrifuge tube to enable liquid remaining on the sealing element to be collected in the bottom of the centrifuge tube. In both of the illustrated constructions the liquid to be transported is safely sealed in the bottom end of the cavity in the liner by the head 26 of the sealing element, and access to the liquid by means of a pipette for example is opened when the cap 13 and the sealing element 25 have been removed. The colourless transparency of the container and the colourless translucency of the liner enable a colour coding of the liquid to be used to identify the liquid in the container, if desired. In some circumstances the container can be used without the inner and outer casings 10a, 10b, 11a and 11b. The containers particularly described above provide a suitable means of transporting small volumes of potentially hazardous liquid materials in a container which has a much larger cavity. This large cavity provides greater convenience of operation. The ratio of liquid to total cavity volume can be typically in the range 1:2 to 1:100.

Claims: CLAIMS 1. For a container having internally thereof a cavity opening to a neck portion of the container and a cap releasably secured on the neck, a liner adapted for disposition in the cavity and having an end flange arranged for engagement on the end of the neck, the liner having internally thereof and spaced from the inner end thereof an annular shoulder facing towards said end flange, and a sealing element for sealing the inner end portion of the liner and comprising a head adapted to form a seal with said shoulder and a stem extending along the liner for engagement with the underside of the cap whereby the cap operates to press said head into sealing engagement with said shoulder. 2. A container having a neck to which opens a cavity formed in the container a cap releasably secured on said neck covering the opening to said cavity, a liner disposed within the cavity and having an end flange by which the liner is supported from the upper end of the neck, the liner having internally thereof and spaced from its inner end an annular shoulder facing towards said end flange, and a sealing element having a head adapted to abut the shoulder and to form a liquid-light seal therewith and a stem extending towards said end flange, the outer end of the stem being arranged for engagement with the underside of the cap such that when the cap is secured on said neck the head of the closure element is held in sealing engagement with the shoulder. 3. A container as claimed in claim 2, wherein said liner is formed from a relatively soft plastics material such as polypropylene and the sealing element is formed from a relatively hard plastics material such as polycarbonate. 4. A container as claimed in claim 2 or claim 3, wherein a part of the stem of the sealing element fitting within the outer end part of the liner has an annular shoulder facing towards said head. 5. A container as claimed in any one of claims 2 to 4, wherein the outer end portion of the stem has an axially outwardly facing recess therein adapted to be engaged by an implement for lifting the sealing element out of the liner when the cap has been removed. 6. A container as claimed in claim 5, wherein the recess is of conical form and the implement is rod-like with a conical end capable of frictionally locking in engagement in said recess to enable the sealing element to be removed from the container. 7. A container as claimed in any one of claims 2 to 4, wherein the outer end of the sealing element is attached to the cap, so that when the cap is released the sealing element can be removed with the cap.

Inventors: FRIEDLANDER URI, STUBBS RICHARD ASHLEY, FRIEDLANDER, URI, STUBBS, RICHARD ASHLEY
Applicants: AMERSHAM INT PLC, FRIEDLANDER URI, STUBBS RICHARD ASHLEY, AMERSHAM INTERNATIONAL PLC, FRIEDLANDER, URI, STUBBS, RICHARD ASHLEY
Application year: 1994
Main classification: G21F5
IPC codes: B65D41, G21F5